Which of the following disorders is a trinucleotide repeat disorder?
A. Huntington disease
B. Marfan syndrome
C. sickle-cell disease
D. cystic fibrosis
E. Tay-Sachs disease
Answer: A
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The unique antigenic determinants of the 90 serotypes of Streptococcus pneumoniae are found
A) on the cell-surface M proteins. B) on the capsular polysaccharides. C) in the bacterial cell wall. D) in the inclusions in the periplasmic space.
A prize is now being offered for anyone who can sequence a complete human genome for less than:
A. $50. B. $100. C. $1000. D. $10,000. E. $100,000.
Which of the following is a true statement? a. All species have the same reaction to their proximity to human development
b. None of the choices. c. Sea turtles are an exception to the effect of suburban development as lighted buildings help them navigate toward the sea. d. The Florida sandhill crane, the leopard frog, and the Houston toad are species that are declining due to suburban development.
In cats, short hair (L) is dominant to long hair
(l); if a short-haired cat of unknown genotype is crossed with a long-haired animal, and they produce one long-haired and one short-haired kittens, this would indicate that
a. the short-haired cat was pure-breeding. b. the short-haired cat was not pure-breeding. c. the long-haired cat was not pure-breeding. d. the long-haired cat was pure-breeding. e. none of these could be determined with only two offspring